Dear moderators of the site, unfortunally, I could not open the files from the category Misc titled:
Zone Assistant (but Slider opened) and Exposure Metering and Zone system calibration (PDF) 8/2003
the links to the files are:
http://www.largeformatphotography.info/articles/zoneassistant.pdf
http://www.largeformatphotography.info/articles/conrad-meter-cal.pdf

thank you very much if you could help me.